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java.lang.NullPointerException at com.vladsch.idea.multimarkdown.psi.impl.PsiImplUtil.lastNonWhiteSpaceChild(PsiImplUtil.java:243) at com.vladsch.idea.multimarkdown.psi.impl.PsiImplUtil.followingBlankLine(PsiImplUtil.java:296) at com.vladsch.idea.multimarkdown.psi.impl.PsiImplUtil.followingBlankLine(PsiImplUtil.java:298) at com.vladsch.idea.multimarkdown.psi.impl.PsiImplUtil.followingBlankLine(PsiImplUtil.java:298) at com.vladsch.idea.multimarkdown.editor.actions.handlers.ListItemContext$Companion.tightenListDeleteLines(ListItemContext.kt:667) at com.vladsch.idea.multimarkdown.editor.actions.handlers.ListItemContext$Companion.canTightenList(ListItemContext.kt:584) at com.vladsch.idea.multimarkdown.editor.actions.styling.ListTightAction.isSelected(ListTightAction.kt:29) at com.vladsch.idea.multimarkdown.editor.actions.styling.ListToggleStateSelectionAction.isSelected(ListToggleStateSelectionAction.kt:66) at com.intellij.openapi.actionSystem.ToggleAction.update(ToggleAction.java:64) at com.vladsch.idea.multimarkdown.editor.actions.styling.ListToggleStateSelectionAction.update(ListToggleStateSelectionAction.kt:80) at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareUpdate(ActionUtil.java:120) at com.intellij.openapi.actionSystem.impl.ActionButton.addNotify(ActionButton.java:181) at java.awt.Container.addImpl(Container.java:1121) at java.awt.Container.add(Container.java:417) at com.intellij.openapi.actionSystem.impl.ActionToolbarImpl.fillToolBar(ActionToolbarImpl.java:308) at com.intellij.openapi.actionSystem.impl.ActionToolbarImpl.updateActionsImpl(ActionToolbarImpl.java:948) at com.intellij.openapi.actionSystem.impl.ActionToolbarImpl.access$000(ActionToolbarImpl.java:64) at com.intellij.openapi.actionSystem.impl.ActionToolbarImpl$1.updateActionsImpl(ActionToolbarImpl.java:173) at com.intellij.openapi.actionSystem.impl.ToolbarUpdater$MyUpdateRunnable.run(ToolbarUpdater.java:191) at com.intellij.openapi.wm.impl.FocusManagerImpl.flushRequest(FocusManagerImpl.java:675) at com.intellij.openapi.wm.impl.FocusManagerImpl.flushNow(FocusManagerImpl.java:656) at com.intellij.openapi.wm.impl.FocusManagerImpl.flushIdleRequests(FocusManagerImpl.java:626) at com.intellij.openapi.wm.impl.FocusManagerImpl.access$200(FocusManagerImpl.java:60) at com.intellij.openapi.wm.impl.FocusManagerImpl$11.run(FocusManagerImpl.java:522) at com.intellij.util.ui.UIUtil.invokeLaterIfNeeded(UIUtil.java:2405) at com.intellij.openapi.wm.impl.FocusManagerImpl.doWhenFocusSettlesDown(FocusManagerImpl.java:500) at com.intellij.openapi.actionSystem.impl.ToolbarUpdater.updateActions(ToolbarUpdater.java:108) at com.intellij.openapi.actionSystem.impl.ToolbarUpdater.access$400(ToolbarUpdater.java:40) at com.intellij.openapi.actionSystem.impl.ToolbarUpdater$MyTimerListener.run(ToolbarUpdater.java:163) at com.intellij.openapi.actionSystem.impl.WeakTimerListener.run(WeakTimerListener.java:54) at com.intellij.openapi.actionSystem.impl.ActionManagerImpl$MyTimer.runListenerAction(ActionManagerImpl.java:1431) at com.intellij.openapi.actionSystem.impl.ActionManagerImpl$MyTimer.notifyListeners(ActionManagerImpl.java:1421) at com.intellij.openapi.actionSystem.impl.ActionManagerImpl$MyTimer.actionPerformed(ActionManagerImpl.java:1405) at javax.swing.Timer.fireActionPerformed(Timer.java:313) at javax.swing.Timer$DoPostEvent.run(Timer.java:245) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:857) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:658) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:386) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)